Azure DocumentDB的技术基础是什么？

微软宣布推出Azure DocumentDB如下......

A fully-managed, highly-scalable, NoSQL document database service.
- Rich query over a schema-free JSON data model
- Transactional execution of JavaScript logic
- Scalable storage and throughput
- Tunable consistency
- Rapid development with familiar technologies
- Blazingly fast and write optimized database service

我非常喜欢"JavaScript逻辑的事务执行".听起来像一个类似于PostgreSQL NoSQL的方法.

任何人都知道Azure DocumentDB服务的技术基础是什么？SQL Server？